Stats & Training
Defense and Attack carry most of Koffing's stat budget. Speed's the obvious dump stat. Common in the wild and yields 1 Defense stat exp. Follows a medium-fast 1M XP curve.
In hot places, its internal gases could expand and explode without any warning. Be very careful!
Koffing Weakness
Ground, Psychic, and Bug moves hit Koffing for super-effective damage. Koffing's physical bulk (base 95 Def) helps cushion physical weakness hits, but special attackers are the bigger threat.
| Damage | Types |
|---|---|
| 2x (Weak) | Ground, Psychic, Bug |
| 0.5x (Resist) | Grass, Fighting, Poison |
- Only 15 types exist — Dark, Steel, and Fairy are absent
- Ghost has no effect on Psychic (a known bug, fixed in Gen II)
- Special stat governs both offense and defense — no Sp.Atk / Sp.Def split
In Yellow, Slowbro's Surf hits Koffing for 67-79%. Golem threatens a KO with Earthquake (120-141%). Pinsir deals 62-73% with Hyper Beam.
 Slowbro WaterPsychic | B | |
Recommended Build Moves
Damage vs Koffing View Slowbro builds →Surf67-79% | ||
 Golem RockGround | B | |
Recommended Build Moves
Damage vs Koffing View Golem builds →Earthquake 2x120-141%KO Explosion99-117%KO Rock Slide45-53% Body Slam34-40% | ||
 Pinsir Bug | B | |
Recommended Build Moves
Damage vs Koffing View Pinsir builds →Hyper Beam62-73% Submission16-19% Bind6-8% | ||
Yellow Evolution
You'll evolve Koffing into Weezing the traditional way. This Poison type doesn't breed despite having a chain ahead. The evolved forms gain up to 135 total stats over Koffing. View every chain in the Evolution Chart.
How to Evolve
Yellow Koffing Best Moveset
Best Build
Utility Moveset
- Explosion
- Fire Blast
- Sludge
- Thunder
Recommended Teammates
Moves
Level-up moves are just the starting point for Koffing. TMs unlock Normal and Fire coverage and turn a straightforward STAB kit around Sludge and Smog into something with actual range.
Level-Up Moves
TM Moves
Egg Moves
Tutor Moves
How to Get Koffing in Yellow
No wild encounters for Koffing in Yellow. It's available in Red, Gold, or Sword and can be transferred over. The details below show where to find it.
Koffing Guide
Koffing is meant to evolve into Weezing. At 355 BST, the stats aren't there for competitive play yet. Pre-evolution Pokemon rarely hold up against fully evolved threats.
Base 35 Speed is low. Priority moves or Trick Room are the way to go. On offense, Koffing is a physical attacker with base 65 Attack.
For Yellow, you can run Koffing through the first few routes without issues. 355 BST won't carry you far though. Get it to Weezing as fast as you can.
Not a straight line. Koffing can become Weezing at level 35 and Galarian Weezing at level 35. Your choice depends on what you need.
Game Availability
One of the original 151, Koffing has appeared in 20 games — most mainline games. From Red & Blue through the latest titles, it's rarely been left out of a regional Pokedex.
Click a game to view version-specific details
- Gen 1Y
Yellow - Gen 1RBDebut
Red & Blue - Gen 2GS
Gold & Silver - Gen 2C
Crystal - Gen 3RS
Ruby & Sapphire - Gen 3FRLG
FireRed & LeafGreen - Gen 3E
Emerald - Gen 4Pt
Platinum - Gen 4HGSS
HeartGold & SoulSilver - Gen 4DP
Diamond & Pearl - Gen 5BW
Black & White - Gen 5B2W2
Black 2 & White 2 - Gen 6XY
X & Y - Gen 6ORAS
Omega Ruby & Alpha Sapphire - Gen 7USUM
Ultra Sun & Ultra Moon - Gen 7SM
Sun & Moon - Gen 7LGPE
Let's Go Pikachu & Eevee - Gen 8SwSh
Sword & Shield - Gen 8PLA
Legends: Arceus - Gen 8BDSP
Brilliant Diamond & Shining Pearl - Gen 9SV
Scarlet & Violet - Gen 9LZA
Legends: Z-A - Gen 10WW
Winds & Waves